Definition of Social Bookmarking on the Web

Social bookmarking is a method for Internet users to share, organize, search, and manage bookmarks of web resources. Unlike file sharing, the resources themselves aren't shared, merely bookmarks that reference them.
en.wikipedia.org/wiki/Social_bookmarking



Advantages of Social Bookmarking

The immediate advantage is access to bookmarked sites from any computer or mobile phone, not just the computer that you made the bookmark on.

Another advantage is expanding and making searches more meaningful: when you bookmark a site you will find others who liked the same site - you can then see what sites they bookmarked and so-on.

The following is a link which does a nice job explaining social bookmarking basics:
http://www.speakingandmarketingtips.com/social-bookmarking.html

Just a few of the many social bookmarking sites:

http://delicious.com/
http://blinklist.com/
http://www.stumbleupon.com/